You can build a price comparison website that lets consumers comparison shop for niche items (anything from aqualungs to golf clubs to sneakers to zippers; you choose the niche) and buy their choice by clicking on a link at your site.

The advantage for you is that you earn an affiliate commission whenever they buy through your link. As a result, comparison sites can be quite profitable.

This plugin creates a popup that shows comparison pricing when the user selecfts an item of interest. Get a demo and more information here.

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